Stock Plans (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

Stock-based compensation is reflected in the consolidated statements of operations as follows for the three and nine months ended September 30, 2018 and 2017 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Research and development	$	1	$	11	$	6	$	24
Sales and marketing		5		38		15		67
General and administrative		16		32		65		71
	$	22	$	81	$	86	$	162

Weighted-average Assumptions used to Estimate Fair Value of Stock Options

The weighted-average assumptions used to estimate the fair value of employee stock options using the Black-Scholes option-pricing model were as follows for the three and nine months ended September 30, 2018 and 2017:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Expected volatility		120.3	%		88.2	%		120.3	%		87.8	%
Expected term (in years)		6.05			6.05			6.05			6.05
Risk-free interest rate		3.0	%		2.1	%		3.0	%		2.1	%
Expected dividend yield		0	%		0	%		0	%		0	%

Share-Based Activity

The following table summarizes share-based activity under the Company’s stock option plans for the nine months ended September 30, 2018:

	Shares of Common Stock Attributable to Options			Weighted- Average Exercise Price		Weighted- Average Contractual Life		Aggregate Intrinsic Value
						(in years)		(in thousands)
Outstanding at December 31, 2017		992,221		$	10.71	5.72		$	63
Granted		122,500		$	—			$	—
Exercised	—			$	—			$	—
Cancelled		(381,043	)	$	5.31			$	—
Outstanding at September 30, 2018		733,678		$	4.67		5.96	$	16
Vested or expected to vest at September 30, 2018		733,678		$	4.67		5.96	$	16
Exercisable at September 30, 2018		337,063		$	—		—	—

Restricted Stock Units and Performance Stock Units Activity

The following table summarizes information related to RSU & PSU activity for the nine months ended September 30, 2018:

	Number of Units			Weighted- Average Contractual Life		Aggregate Intrinsic Value
				(in years)		(in thousands)
Outstanding at December 31, 2017		392,659			8.27	$	429
Granted	—
Exercised	—
Cancelled		(142,659	)	—		—
Outstanding at September 30, 2018		250,000			7.48	$	208